Walter Roberson <email@example.com> wrote in message > > > As you are using objects, then you need to discuss with the > administrators of the HPC site how to save the file on a drive that is > local to the CPU you are using rather than being on a networked file system. > > There has been no information from Mathworks posted on this forum as to > _why_ the -v7.3 format can be as slow as it is, but there have been > enough reports from users that we know that this is a fact of life for > some kinds of data on some systems, at least up to 2010a. (People > haven't happened to discuss it for 2010b.) >
I can verify that this isn't just a problem for 2010a and before, and isn't just a problem for saving to networked drives. I have a 60 MB matrix of .fit objects that takes hours and hours and hours to save to the local disk in 2010b. Luckily, after it completes saving after a ridiculously long time (this happens whether I call with -v7.3 or not), it only takes 30 sec or so to load in the future, so I don't have to re-compute the data every time.